[TYPO3-UG Dutch] extensions manager problem

[Info]

Hello,

Can someone help me out with this:

I've made a fresh install of typo3 version 4.0.4. on my webserver.
Everything works fine. I'm able to configure my installation en login to the
backend. 

However: in the backend I found one fatal error. When I hit the link to the
"Extension Manager" nothing happens! I get a blank page with the following
error:

Fatal error: Cannot instantiate non-existent class: sc_mod_tools_em_index in
/(root of my webserver)/t3lib/class.t3lib_div.php on line 3994

Can someone help me out here? 

Thanx!

Christian
info at christianengerdien.nl

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